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A discontinuous crystallization unit for the production of ball-shaped crystals

A technology of crystallization units and spherical crystals, applied in the field of discontinuous crystallization units, to achieve excellent control, easy process, precise and controllable process

Active Publication Date: 2017-02-22
ERUCA TECH SRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using this method, very small particles (fragments) will additionally be formed, which is disadvantageous

Method used

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  • A discontinuous crystallization unit for the production of ball-shaped crystals
  • A discontinuous crystallization unit for the production of ball-shaped crystals
  • A discontinuous crystallization unit for the production of ball-shaped crystals

Examples

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Embodiment 1

[0050] For the preparation of spherical crystals of ammonium perchlorate, a discontinuous crystallization unit is used, comprising a crystallizer (1) consisting of a metal cylindrical container of enamelled metal, the metal The internal surface of the cylindrical vessel is polished stainless steel, has an oval or circular cross-section, has a tapered or arched bottom (12), and is fitted with a double jacket (4 ), for cooling the solution and / or the suspension of the solution and crystals; and a stainless steel high-speed stirrer (8) having a drive (9) for speed control and thus Together with the internal surface of the vessel containing 2 polished stainless steel baffles (5) to control the impact rate of the mechanical action of the stirrer on the roundness of the crystals inside the vessel, at the same time an orifice (10) is installed on the top of the vessel, which will be independent from the outside 1 loop of the circulation line (11) is connected to said orifice (10) for...

Embodiment 2

[0065] The same discontinuous crystallization unit as in Example 1 is used, but it comprises 2 circulation loops 11,11' for feeding heated solution or solutions using circulation pumps 2,2' and via heat exchangers 3,3' and Heated suspensions of crystals, such as figure 2 shown.

[0066] This arrangement of the unit makes it possible to increase the number of crystallization cycles with the same cooling rate and / or to reduce the flow rate in the branches of the circulation loop.

[0067] The overall APC crystal preparation process is the same as that in Example 1.

[0068] The resulting crystals have a more rounded shape; moreover, compared to Example 1, they exhibit the same purity and particle distribution.

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Abstract

The invention introduces a discontinuous crystallization unit for the production of ball- shaped crystals comprising a crystallizer (1) that consists of a metallic cylindrical vessel with its inner surface of a hard material, with an oval or circular cross-section with a conical or vaulted bottom (12), fitted along its length with a duplicator (4) for cooling of the solution and / or suspension of the solution and crystals and a high-speed agitator (8) of a hard material with a drive (9) enabling speed control and thus the rate of the impact of the mechanical action of the agitator on roundness of crystals inside the vessel together with the inner surface of the vessel containing at least 2 baffles (5) of a hard material while the vessel is fitted with at least 1 orifice (10) at the top that at least 1 independent branch of the circulation circuit (11) is connected to from the outside for the inlet of a heated solution and / or heated suspension of the solution and crystals by means of at least 1 circulation pump (2) and through at least 1 heat exchanger (3) and together with the duplicator (4) ensuring controlled periodic changes of temperatures of the crystal suspension around the cooling curve while an interconnection (13) pipeline is connected to the bottom (12) of the crystallizer (1) vessel that is connected to at least one branch of the circulation circuit (11).

Description

[0001] field of invention [0002] The present invention relates to discrete crystallization units for the preparation of small to medium sized spherical crystals, preferably ammonium perchlorate (APC) crystals. Background technique [0003] In the prior art, various methods are described for the preparation of spherical crystals. It is known from both theory and practice that smaller crystals exhibit higher solubility than larger crystals and that rectangular crystal surfaces dissolve more readily than spherical surfaces. Crystallization in such a way that the temperature fluctuates periodically around the temperature of the saturated solution is based on this phenomenon. Therefore, crystal nuclei, smaller crystals, and rectangular crystal surfaces are more easily dissolved, while larger crystals, on the other hand, show preferential growth. In this way, a roughly granular product is prepared. [0004] An example of such a method for preparing spherical crystals is found i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/00C01B11/18C06B21/00C06B29/00
CPCB01D9/00B01D9/0009B01D9/0036B01D9/0063B01D2009/0086C06B21/0066C06B29/22B01D9/0013C01B11/185C30B7/08C30B29/60
Inventor M·索切克J·密西克J·库普卡
Owner ERUCA TECH SRO
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